Summarized Performance of Volumes by Server report

Shows summarized performance metrics for volumes on a server. Use the report to identify the aggregate load and the average response time of a particular server.

Charts

The charts show the following performance metrics for the volumes on a server:

The total I/O rates and the total response times
The read I/O rates, the write I/O rates, the read response times, and the write response times
The read data rates, the write date rates, and the total data rates
The read cache percentages and the write cache percentages

Report output

The following information is provided in the report for the period that you specified:

Server Name: The fully qualified domain name of the server. For example, the name of a server might be server.example.com.
Day, hour, or time: The day, hour, or time at which the information about the specified resource or device was collected. Whether the day, hour, or time is displayed depends on the interval that you select for the report.
Overall Response Time (ms/op): The average number of milliseconds to complete an I/O operation, across all volumes on the server. This value includes both read and write operations.
Total Overall I/O Rate (ops/s): The average number of read operations and write operations per second, across all volumes on the server. This value includes both sequential and nonsequential operations. The average value for each volume is added to give a total I/O rate for all volumes on the server.
Total Data Rate (MiB/s): The average number of MiB per second that are transferred for read operations and write operations, across all volumes on the server. The average value for each volume is added to give a total data rate for all volumes on the server.
Write Response Time (ms/op): The average number of milliseconds to complete a write operation, across all volumes on the server.
Read Response Time (ms/op): The average number of milliseconds to complete a read operation, across all volumes on the server.
Read Data Rate (MiB/s): The average number of MiB per second that are transferred for read operations, across all volumes on the server. The average value for each volume is added to give a read data rate for all volumes on the server.
Write Data Rate (MiB/s): The average number of MiB per second that are transferred for write operations, across all volumes on the server. The average value for each volume is added to give a write data rate for all volumes on the server.
Overall Read I/O Rate (ops/s): The average number of read operations per second, which is totaled for all volumes on the server. This value includes both sequential and nonsequential read operations.
Overall Write I/O Rate (ops/s): The average number of write operations per second, which is totaled for all volumes on the server. This value includes both sequential and nonsequential write operations.
Overall Read Cache Hit Percentage: The average percentage of all read operations that find data in the cache, across all volumes on the server. This value includes both sequential and nonsequential read operations.; You can use this value to understand throughput or response times. Low cache-hit percentages can increase response times because a cache miss requires access to the back-end storage resources.
Overall Write Cache Hit Percentage: The average percentage of all write operations that are handled in the cache, across all volumes on the server. This value includes both sequential and nonsequential write operations.

Related reports

To open the Performance of Volumes by Server report, click the name of the server in the report table.